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Proceedings Paper

Nuclear feedback in a single electron-charged quantum dot under pulsed optical control
Author(s): Thaddeus D. Ladd; David Press; Kristiaan De Greve; Peter L. McMahon; Benedikt Friess; Christian Schneider; Martin Kamp; Sven Höfling; Alfred Forchel; Yoshihisa Yamamoto
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Paper Abstract

Electron spins in quantum dots under coherent control exhibit a number of novel feedback processes. Here, we present experimental and theoretical evidence of a feedback process between nuclear spins and a single electron spin in a single charged InAs quantum dot, controlled by the coherently modified probability of exciting a trion state. We present a mathematical model describing competition between optical nuclear pumping and nuclear spin-diffusion inside the quantum dot. The model correctly postdicts the observation of a hysteretic sawtooth pattern in the free-induction-decay of the single electron spin, hysteresis while scanning a narrow-band laser through the quantum dot's optical resonance frequency, and non-sinusoidal fringes in the spin echo. Both the coherent electron-spin rotations, implemented with off-resonant ultrafast laser pulses, and the resonant narrowband optical pumping for spin initialization interspersed between ultrafast pulses, play a role in the observed behavior. This effect allows dynamic tuning of the electron Larmor frequency to a value determined by the pulse timing, potentially allowing more complex coherent control operations.

Paper Details

Date Published: 12 February 2011
PDF: 15 pages
Proc. SPIE 7948, Advances in Photonics of Quantum Computing, Memory, and Communication IV, 79480U (12 February 2011); doi: 10.1117/12.873978
Show Author Affiliations
Thaddeus D. Ladd, Stanford Univ. (United States)
National Institute of Informatics (Japan)
David Press, Stanford Univ. (United States)
Kristiaan De Greve, Stanford Univ. (United States)
Peter L. McMahon, Stanford Univ. (United States)
Benedikt Friess, Stanford Univ. (United States)
Julius-Maximilians-Univ. Würzburg (Germany)
Christian Schneider, Julius-Maximilians-Univ. Würzburg (Germany)
Martin Kamp, Julius-Maximilians-Univ. Würzburg (Germany)
Sven Höfling, Stanford Univ. (United States)
Julius-Maximilians-Univ. Würzburg (Germany)
Alfred Forchel, Julius-Maximilians-Univ. Würzburg (Germany)
Yoshihisa Yamamoto, Stanford Univ. (United States)
National Institute of Informatics (Japan)

Published in SPIE Proceedings Vol. 7948:
Advances in Photonics of Quantum Computing, Memory, and Communication IV
Zameer Ul Hasan; Philip R. Hemmer; Hwang Lee; Charles M. Santori, Editor(s)

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